ListBox 控件允许用户从预定义的列表中选择一个或多个项。
它与DropDownList 控件的不同之处在于，它不但可以一次显示多个项，而且（可选）还允许用户选择多个项。
一、属性属性值作用SelectionModeSingle|Multiple列表选择模式：单选|多选SelectedFalse|true是否为选中状态二、示例ListBox.aspx代码如下:<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ListBox.aspx.cs" Inherits="WebControls_ListBox" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="/1999/xhtml"><head runat="server"> <title></title> <style type="text/css"> .style1 { width: 293px; } .style2 { width: 233px; } </style></head><body> <form id="form1" runat="server"> <div> <h5>1,单选列表框</h5> 省份：<asp:ListBox ID="lstProv" runat="server"> <asp:ListItem>山东</asp:ListItem> <asp:ListItem Selected="True">河北</asp:ListItem> <asp:ListItem>内蒙</asp:ListItem> <asp:ListItem>安徽</asp:ListItem> </asp:ListBox> <br /> <asp:Button ID="btnSubmit" runat="server" Text="提交"onclick="btnSubmit_Click" /> <hr /> 你选择的为：<asp:Label ID="lblState" runat="server"></asp:Label> <hr /> <h5> 2,多选列表框</h5> 省份：<asp:ListBox ID="lstProv2" runat="server" SelectionMode="Multiple"> <asp:ListItem>山东</asp:ListItem> <asp:ListItem Selected="True">河北</asp:ListItem> <asp:ListItem>内蒙</asp:ListItem> <asp:ListItem>安徽</asp:ListItem> </asp:ListBox> 提示：Ctrl+单击<br /> <asp:Button ID="btnSubmit2" runat="server" Text="提交" onclick="btnSubmit2_Click" /> <hr /> 你选择的为：<asp:Label ID="lblState2" runat="server"></asp:Label> </div> </form></body></html>ListBox.aspx.cs代码如下:using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class WebControls_ListBox : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { } protected void btnSubmit_Click(object sender, EventArgs e) { lblState.Text = lstProv.SelectedValue; } protected void btnSubmit2_Click(object sender, EventArgs e) { string str = string.Empty; for (int i = 0; i < lstProv2.Items.Count; i++) { if (lstProv2.Items[i].Selected == true) { str = string.Format("{0}{1},",str,lstProv2.Items[i].Value); } } str = str.Substring(0, str.Length - 1); //去掉最后一个“,” lblState2.Text = str; }}。